68results about How to "Reduce nodulation" patented technology

The invention relates to a smelting method of ultra-low-carbon steel, which is an operating method for decarburizing by using a single-nozzle refining furnace. The invention is a smelting method for smelting ultra-low-carbon steel by using the single-nozzle refining furnace. The method is used for smelting the ultra-low-carbon steel with C of being less than or equal to 20ppm, and adjusts the inserting depth of a single-nozzle furnace dipping pipe, lance position of an oxygen lance, vacuum degree, oxygen supplying flow and eccentric bottom-blown argon of a steel ladle to stir molten steel under the vacuum condition by controlling the initial conditions of the thickness of a tapping slag layer, the temperature of arrived molten steel, the content of arrived carbon and the like so as to achieve the purpose of decarburization. The method has the following advantages that: 1. the treatment time of the molten steel is short, the refractory material consumption is low, and the scaffolding of the dipping pipe is little; and 2. the smelting time is short, the splashing is little, the consumption of sealing rings is less, the corrosion of the steel ladle is not serious, the cost is low andthe operation is simple.

The invention discloses a nozzle flow rotating generation device and a nozzle flow rotating continuous casting method. The device comprises a cylinder type flow rotating generator and a cylinder type flow rotating tundish; the cylinder type flow rotating generator is mounted in a traditional continuous casting tundish, and an inner cavity of the traditional continuous casting tundish is communicated with an immersion type nozzle through the cylinder type flow rotating generator; the cylinder type flow rotating tundish has two mounting modes; according to the first mode, the cylinder type flow rotating tundish and the traditional continuous casting tundish are used in a cooperated manner, the cylinder type flow rotating tundish is mounted on the outer portion of the traditional continuous casting tundish, and the traditional continuous casting tundish is communicated with the immersion type nozzle through the cylinder type flow rotating tundish; and according to the second mode, the cylinder type flow rotating tundish is independently used, and a nozzle of a steel ladle is communicated with the immersion type nozzle directly through the cylinder type flow rotating tundish. The method comprises the steps that before continuous casting, according to the continuous casting technology, the nozzle flow rotating generation device is selected, then, the device and the traditional continuous casting tundish are assembled, during continuous casting, under the effects of molten steel gravity and tangent line entrances, molten steel generates rotating flowing, and molten steel in the immersing type nozzle generates rotary flowing.

The invention provides an electroforming nickel component forming method. The method comprises the following steps: a, producing a pictographic auxiliary cathode, namely producing a pictographic auxiliary cathode in a concentrated area of electric wires according to the distribution characteristic of current on a core mold, wherein the pictographic auxiliary cathode is a framework structure made of a metal conductor, the pictographic auxiliary cathode comprises a central skeleton, a left side wing frame and a right side wing frame, and the contour of the central skeleton and the wing frames is maintained consistent with that of the concentrated area of the electric wire; b, electroforming, namely, placing the core mold in a plating solution, fixing two ends of the central skeleton of the pictographic auxiliary cathode onto the core mold, integrally covering the core mold by virtue of the pictographic auxiliary cathode, wherein the distance between the pictographic auxiliary cathode and the core mold is 10mm to 20mm, the core mold and the pictographic auxiliary cathode are respectively connected with an electroforming cathode, an electroforming anode is connected with a nickel plate, the electroforming process parameter is as follows: the current density is 16 to 18 A / dm<2>, and the electroforming time is 13 to 16 hours; and c, taking out the component from the core mold.